If they are anything like the Mercedes key that the system is based off of I would stock them (you can find them cheap on amazon).

The system starts acting crazy when the battery gets low, and they die fast. I found with the Mercedes the batteries are not dead when the remote stops working, they work fine in other remotes/devices for quite a bit longer.

Yes, a battery or two stowed in your vehicle is a good and cheap idea, and not quite but near equivalent to a hide-a-key. Others hide an extra fobik without the battery, plus a stowed battery elsewhere in their vehicles.

Some also report skinny jeans as the culprit for premature fobik battery wear. YMMV.

This got me thinking that I should get another battery. Does any one know which number it is, I don't have the FOB with me right now.

It's a CR2032. That's a standard button cell size- you should even be able to find them at Walmart.

This thread has me thinking I'll pick up a couple of them and keep them inside the vehicle. They generally have a decent shelf life, but the emergency key should get me inside if need be, then I can swap out the battery at that point.

It's a CR2032. That's a standard button cell size- you should even be able to find them at Walmart.

This thread has me thinking I'll pick up a couple of them and keep them inside the vehicle. They generally have a decent shelf life, but the emergency key should get me inside if need be, then I can swap out the battery at that point.

Low temperature affects battery life - do you know if this is also the case when it's not used but just stored in the car during the winter? In other words - how often would you replace your spare batteries?

Man this kind of sucks if its going to be like this. Keyless access and push button starts arent even new systems...not even close. I wonder why people are having battery issues. My first Corvette from 2005 had keyless access and push start and fob batteries were never an issue for the corvette guys.

This may sound like a weird idea especially since apparently in the Jeep the fob needs to be within a couple feet of the door to work, but at night where do you put your keys when not driving? ie. on the kitchen counter? leave them in the jeep? etc etc Just curious maybe people leave there keys close enough to the Jeep at night where its causing some sort of constant communication between the fob and receivers in the Jeep. Its got to be something because no key fob, let alone two key fobs should never die anywhere near that quick on a new vehicle. Infact, I have never replaced a keyfob battery in my life and I have had new and old cars.

This is going to be a PITA if I have to constantly screw with batteries and a finicky keyless access system.

Low temperature affects battery life - do you know if this is also the case when it's not used but just stored in the car during the winter? In other words - how often would you replace your spare batteries?

That's a good point, but Lithium cells aren't as susceptible to it as lead/acid or other types. Yes, weather can and will affect them, but if your fob battery is gone, chances are decent that you'll have enough energy in the spare cell for the fob to work.

One set of keys hangs at the front door, another basically stays in my pocket 100% of the time. The jeep is far enough away in the garage. I suppose it's possible for the one in my pocket to have the "skinny jean" effect, but I'm certainly NOT skinny and don't wear those type of jeans.

I'm going to hope that these were old FOBs or something (I know, sounds stupid) and they were low on battery to begin with, and fresh batteries for each may help.

I have a brand new one in back in FOB #1 and I'll report back if I have any problems. I've got to imagine that other people would be posting if their batteries were only lasting 3-4 weeks a pop, so hopefully it's an isolated problem.